There is a lot more radiation that makes it to the surface of Mars than here, due to our atmosphere and stronger magnetic field.
need more tin foil
Hard to understand how the shielding could have been inadequate, along with strategies to recover from memory errors.
Turns out that the amount of radiation reaching the surface is considerably less than they expected. One of the earliest findings from this rover was that the radiation at surface level was comparable to what our astronauts experience on the space station.
I’m assuming the damage was likely done in transit.